Yi Qiang
Feb. 24, 2017


Spatial metrics, such as distance, area and volumne
Surface adjusted distance
hydrological modeling

Landslide modeling
Suitability modeling

Essentially a raster of elevation (2D matrix)
DEM in 3D

A vector model for 3D terrain

Delaunay Triangulation between sampling points
A facet of TIN in 3D
Resolution of TIN - number of triangles
Surface adjusted area is the total area of all the triangular facets


Geometric combination of vertical (x direction) descent and horizontal (y direction) descent
Elevation to Slope



Most GIS packages provide tools for examining the profile of a surface along a selected straight line or series of straight line segments (polyline).

Profile along multiple straight transects





Original DEM - hill
Cumulative solar radiation in a day (Area Solar Radiation tool in ArcGIS)

Solar Radiation: Summer Solstice

Solar Radiation: Winter Solstice

Change of topics: Topic 5: Spatial Interpolation -> Hazard risk and vulnerability assessment Topic 6: Advanced spatial modeling -> Web mapping Next class -> Project discussion